Botron's B9201 is designed to monitor resistance of the operator's path to ground. It comes with a built in audible alarm and LED, triggering either when the operator falls out of spec, becomes disconnected, or ground is lost. It is a fixed resistor system and is go/no go, there is no calibration needed but it is recomended to verify all units are operating correctly with a B9203TB. A full time monitoring system is necessary to reduce latency on the assembly line.